This document discusses different narrative structures and theories of narrative. It describes linear narratives as having a clear beginning, middle, and end, while circular narratives end where they begin. The document outlines Todorov's narrative theory of equilibrium being disrupted, then recognized and resolved to restore equilibrium. It also mentions Vladimir Propp's identification of character roles and functions that move stories along. The document analyzes different narrative codes and binary oppositions in stories. It concludes with an example applying Todorov's theory to the plot structure of the film Sweeney Todd.